MAX5974A MAXIM [Maxim Integrated Products], MAX5974A Datasheet - Page 11

• Manufacturer Part Number: MAX5974A
• Description: Active-Clamped, Spread-Spectrum, Current-Mode PWM Controllers
• Manufacturer: MAXIM [Maxim Integrated Products]

PIN
1
2
3
4
5
DITHER/
NAME
COMP
SYNC
FFB
DT
RT
Dead-Time Programming Resistor Connection. Connect resistor R
the desired dead time between the NDRV and AUXDRV signals. See the Dead Time section to
calculate the resistor value for a particular dead time.
Frequency Dithering Programming or Synchronization Connection. For spread-spectrum frequency
operation, connect a capacitor from DITHER to GND and a resistor from DITHER to RT. To
synchronize the internal oscillator to the externally applied frequency, connect DITHER/SYNC to
the synchronization pulse.
Switching Frequency Programming Resistor Connection. Connect resistor R
set the PWM switching frequency. See the Oscillator/Switching Frequency section to calculate the
resistor value for the desired oscillator frequency.
Frequency Foldback Threshold Programming Input. Connect a resistor from FFB to GND to set the
output average current threshold below which the converter folds back the switching frequency to
1/2 of its original value. Connect to GND to disable frequency foldback.
Transconductance Amplifier Output and PWM Comparator Input. COMP is level shifted down and
connected to the inverting input of the PWM comparator.
Active-Clamped, Spread-Spectrum,
TOP VIEW
Current-Mode PWM Controllers
DCLMP
EN
SS
IN
13
14
15
16
+
12
1
THIN QFN
MAX5974A
MAX5974B
MAX5974C
MAX5974D
11
2
10
3
FUNCTION
EP
9
4
8
7
6
5
CSSC
GND
FB
COMP
DT
from DT to GND to set
Pin Configuration
Pin Description
RT
from RT to GND to
11